Skewed Dovetail Chisel

Re: Skewed Dovetail Chisel

Dan Clermont

>Hi Brian,

I belive Rob simply uses a grinder and grinds a 1:7 or 1:8 rake on the sides of the chisel.

Have a Merry Christmas

Dan Clermont

Re: Skewed Dovetail Chisel

Derek Cohen (in Perth Australia)

>Hi Brian

Here is my copy of Rob's dovetail chisel. I ground up a rusty 3/4" Witherby at 8:1.

Regards from Perth

Derek

Question for you, Derek...

Doug Trembath

>Maybe I drank an extra pint last night, but does this simply have one long bevel to the cutting edge? Does the 1:8 relate to the flats of the chisel, or the edges? No access to Rob's video, so I have to read between the lines. When I read Brian's initial post, I assumed that a dovetail chisel would have the edges beveled severely to eliminate the marking on the corners of the tails as you trim the waste. I have seen posts regarding some Japanese dovetail chisels ground like this such that you had to be careful because they were actually sharp. Can you explain to an old farm boy how this is related?

Thanks,

Doug Trembath

Studio in the Woods

OOPS! ...Follow-up

Doug Trembath

>Dummy me, I forgot to ask what was actually skewed, as well?

Again, thanks...

Doug Trembath

Studio in the Woods

Re: Question for you, Derek...

Derek Cohen (in Perth Australia)

>Hi Doug

This skew chisel is for cleaning out half-blind pins. There, the walls are vertical (so no side wall angles to get in the way) but the corners angle away and are impossible to get into with a squared (straight sided) chisel. This chisel gets into those corners. One could use a single-sided skew chisel, but Robs' argument is that you have to push sideways to pare with one. This double-sided skew pares on the forward push.

I still use the single-sided skew chisels, but reserve these for cleaning out the inside corners of tail walls (where you have to pare sideways).

Regards from Perth

Derek

Re: Question for you, Derek...

ThomD

>I have a feeling that I am going to need to make or buy some fishtail chisels! Any excuse is a good excuse. I think they should rock for the tails moreso, because you could get them in tight, but not risk bruising the tails (like this is a big deal, still...). However, I haven't ever needed this kind of rig for half-blind pins. I use Frid's technique with the saw blade. Instead I use a small thin drywall knife, and hammer it in from the ends. so the sidewalls are all clean from the begining. Releasing these cuts I would think a skew chisel would be handy, but I haven't needed one? I have LV skews, so maybe I used those and just forgot.

Re: Question for you, Derek...

paul womack

>. One could use a single-sided skew chisel, but Robs' argument is that you have to push sideways to pare with one.

Surely the skew actually pulls the blade nicely against the side wall?

If one pushes the chisels (straight) parallel to the wall of the DT socket, that is.

BugBear

Reply to Bug Bear

Derek Cohen (in Perth Australia)

>Hi BB

Your picture makes it look like a push is possible, but my (standard) Crown skew chisels are skewed more acutely than the chisels in your picture. They could be reground but then they would not be as effective when cleaning up inside tails (where I need to pare laterally). Some pics below for reference.

Regards from Perth

Derek

Re: Reply to Bug Bear

paul womack

> They could be reground but then they would not be as effective when cleaning up inside tails (where I need to pare laterally).

Hmm. Can you expand on this? I'm not "seeing the picture"

I have to admit - before I saw your photo, I'd assumed that skew chisels WERE ground as per my diag, so I've learnt something ;-)

BugBear

Re: Reply to Bug Bear

Derek Cohen (in Perth Australia)

>Hi BB

"Inside the tails", as in picture below (hastily drawing with Paint).

Regards from Perth

Derek

Re: Reply to Bug Bear

paul womack

>Thanks - picture makes it quite clear what you're talking about.

But I use "normal" (square ended, bevel edged) chisels for that operation; I thought that's what bevel edged chisels were for.

I don't see any need (or benefit) for skew chisels for this opeation, but I'm willing to learn.

BugBear

Re: Reply to Bug Bear

ThomD

>The disadvanatge to skew chisels is you need two and you need to pick them up etc... The advantage to the one ROb has or a butterfly chisel is it doesn't need to be changed for any one of the cuts, except as apertures require. I'm not saying that maters in my real world, merely a "point".